Wind chills of minus 35 to 65 are expected through the period. Exposed skin can get frostbite in as little as 5 minutes when the wind chill is 50 below, and Twin Cities metro area wind chills are expected to be minus 50 or lower from Tuesday evening through early Wednesday morning, then in the 40s below zero the remainder of Wednesday into early Thursday.Ron TondraMeteorologist, Updraft Blog

Very interesting book “Why We Sleep: Unlocking the Power of Sleep and Dreams” by Matthew Walker, PhD, Drector of the Center for Human Sleep Science at the University of California, Berkeley. In an interview, Dr Mathews warns that most of us don’t get enough good sleep offers strategies for getting enough sleep. ∞

This week Minnesota, Midwest and much of US is diving into bitter cold waves of air generated by a phenomenon call ‘Polar Vortex‘ (low pressure in cold air surrounding the poles). The temperatures are expected to be in single digit to subzero on some days with windchill reaching lower than -20F.